1-- FC70C00.A 2-- 3-- Grant of Unlimited Rights 4-- 5-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687, 6-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 7-- unlimited rights in the software and documentation contained herein. 8-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making 9-- this public release, the Government intends to confer upon all 10-- recipients unlimited rights equal to those held by the Government. 11-- These rights include rights to use, duplicate, release or disclose the 12-- released technical data and computer software in whole or in part, in 13-- any manner and for any purpose whatsoever, and to have or permit others 14-- to do so. 15-- 16-- DISCLAIMER 17-- 18-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR 19-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 20-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE 21-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 22-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A 23-- PARTICULAR PURPOSE OF SAID MATERIAL. 24--* 25-- 26-- FOUNDATION DESCRIPTION: 27-- This foundation defines a generic list abstraction in two packages. 28-- The first package declares the types, the second declares the 29-- operations. List elements can be of any (nonlimited) type. Lists are 30-- implemented as singly linked lists. Access to list elements is 31-- sequential. For each list, pointers are maintained to the first and 32-- last elements in the list, as well as the next element to be accessed. 33-- 34-- CHANGE HISTORY: 35-- 06 Dec 94 SAIC ACVC 2.0 36-- 37--! 38 39generic 40 type Element_Type is private; -- List elems may be of any nonlimited type. 41package FC70C00_0 is -- List abstraction. 42 43 type Node_Type; 44 type Node_Pointer is access Node_Type; 45 46 type Node_Type is record 47 Item : Element_Type; 48 Next : Node_Pointer; 49 end record; 50 51 type List_Type is record 52 First : Node_Pointer; 53 Current : Node_Pointer; 54 Last : Node_Pointer; 55 end record; 56 57end FC70C00_0; 58 59 60 --==================================================================-- 61 62 63-- No body for FC70C00_0; 64 65 66 --==================================================================-- 67 68 69with FC70C00_0; -- List abstraction. 70generic 71 with package List_Mgr is new FC70C00_0 (<>); 72package FC70C00_1 is -- Basic list operations. 73 74 -- Return true if current element is last in the list. 75 function End_Of_List (L : List_Mgr.List_Type) return Boolean; 76 77 -- Set "current" pointer to first list element. 78 procedure Reset (L : in out List_Mgr.List_Type); 79 80end FC70C00_1; 81 82 83 --==================================================================-- 84 85 86package body FC70C00_1 is 87 88 function End_Of_List (L : List_Mgr.List_Type) return Boolean is 89 use List_Mgr; -- Renders "=" directly visible. 90 begin 91 return (L.Current = null); 92 end End_Of_List; 93 94 95 procedure Reset (L : in out List_Mgr.List_Type) is 96 begin 97 L.Current := L.First; -- Set "current" pointer to first 98 end Reset; -- list element. 99 100end FC70C00_1; 101